The Duchess is dropping her backside overnight and now it only takes a couple of hours. It's not one corner but both rear bags at once and there's often an air leak type sound from the valve block/pump area when you shut the engine off. I'm guessing it's time to rebuild the solenoid/NRV/etc seals - could you please recommend a decent set as I seem to recall that there are some which are not as good as others.
I'm also hoping to replace both rear bags if the weather isn't too horrible as the offside rear picked up an advisory for being perished.
Maybe that'll see her right?!